Transport properties of superionic conducting glasses (AgX)0.4(Ag2O)0.3(GeO2)0.3 (X = I, Br, Cl)

Kang, S and Waseda, Y and Jacob, KT and Saito, M (2000) Transport properties of superionic conducting glasses (AgX)0.4(Ag2O)0.3(GeO2)0.3 (X = I, Br, Cl). In: Materials transactions - JIM, 41 (12). pp. 1670-1674.

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Abstract

In order to identify the dominant mechanism of ionic conduction, the electrical conductivity and ionic mobility of the glasses (AgX)0.4(Ag2O)0.3(GeO2)0.3 (X = I, Br, Cl) were measured separately in the temperature range from 293 to 393 K by coupling the AC technique with the TIC method. Electronic conductivity was also measured at 293 K by the Wagner polarization method. The total electrical conductivity of these glasses was found to be as high as 10-1 Ω-1 m-1, and the mobility about 10-6 m2 V-1 s-1. The variation of total electrical conductivity and mobility at constant temperature and composition with the type of halide occurred in the sequence, Cl < Br < I. For each composition, both conductivity and mobility increased with temperature. The mobile ion concentration was found to be about 1023 m-3 at 293 K, and it was insensitive to the type of halide as well as temperature. The results suggest that the change in ionic conductivity with the temperature and the type of halide present is mainly attributable to the change in ionic mobility rather than carrier concentration. Moreover, the electronic conductivity was found to be about 10-6 Ω-1 m-1 at 293 K. Thus, the electronic contribution to the total conductivity is negligibly small.

Item Type:	Journal Article
Publication:	Materials transactions - JIM
Publisher:	Japan Institute of Metals
Additional Information:	Copyright of this article belongs to Japan Institute of Metals.
Keywords:	Superionic conductors;Glass;Transport properties;Silver iodides;Silver bromides;Silver chlorides;Binary compounds; Silver oxides;Germanium oxides;Electrical conductivity; Temperature effects;Mobility;Experimental study
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	29 Dec 2011 07:52
Last Modified:	29 Dec 2011 07:52
URI:	http://eprints.iisc.ac.in/id/eprint/42714

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